期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 12, 页码 8020-8034出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c00848
关键词
Acidithiobacillus ferrooxidans; Fe ore tailings; elemental sulfur oxidation; alkaline pH neutralization; mineral weathering; nanosized secondary minerals; extracellular polymeric substances
资金
- Australian Research Council Linkage Project [LP160100598]
- Karara Mining Limited
- Botanic Gardens and Parks Authority (BGPA)
- China Scholarship Council (CSC)-UQ Ph.D. Scholarship [201708130086]
- ANSTO [AS2/SXR/16207, AS191/XAS/14392]
- Australian Research Council [LP160100598] Funding Source: Australian Research Council
Through a microcosm experiment, it was found that Acidithiobacillus ferrooxidans and sulfur element interacted to rapidly neutralize alkaline Fe ore tailings; activities of A. ferrooxidans induced weathering of primary Fe-bearing minerals (e.g. biotite) and formation of secondary minerals (e.g. ferrihydrite and jarosite); the association between bacterial cells and tailings minerals was likely facilitated by extracellular polymeric substances (EPS).
The neutralization of strongly alkaline pH conditions and acceleration of mineral weathering in alkaline Fe ore tailings have been identified as key prerequisites for eco-engineering tailings-soil formation for sustainable mine site rehabilitation. Acidithiobacillus ferrooxidans has great potential in neutralizing alkaline pH and accelerating primary mineral weathering in the tailings but little information is available. This study aimed to investigate the colonization of A. ferrooxidans in alkaline Fe ore tailings and its role in elemental sulfur (S-0) oxidation, tailings neutralization, and Fe-bearing mineral weathering through a microcosm experiment. The effects of biological S-0 oxidation on the weathering of alkaline Fe ore tailings were examined via various microspectroscopic analyses. It is found that (1) the A. ferrooxidans inoculum combined with the S-0 amendment rapidly neutralized the alkaline Fe ore tailings; (2) A. ferrooxidans activities induced Fe-bearing primary mineral (e.g., biotite) weathering and secondary mineral (e.g., ferrihydrite and jarosite) formation; and (3) the association between bacterial cells and tailings minerals were likely facilitated by extracellular polymeric substances (EPS). The behavior and biogeochemical functionality of A. ferrooxidans in the tailings provide a fundamental basis for developing microbial-based technologies toward eco-engineering soil formation in Fe ore tailings.
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